class_docstr: Datasets introduced in
  `Geom-GCN: Geometric Graph Convolutional Networks
  <https://arxiv.org/abs/2002.05287>`__
  
  Parameters
  ----------
  name : str
      Name of the dataset.
  raw_dir : str
      Raw file directory to store the processed data.
  force_reload : bool
      Whether to re-download the data source.
  verbose : bool
      Whether to print progress information.
  transform : callable
      A transform that takes in a :class:`~dgl.DGLGraph` object and returns
      a transformed version. The :class:`~dgl.DGLGraph` object will be
      transformed before every access.
code: def has_cache(self):
      return os.path.exists(self.raw_path)
  
imports: import os
  import numpy
  from ..convert import graph
  from .dgl_dataset import DGLBuiltinDataset
  from .utils import _get_dgl_url
label_desc: Use image node_id 3 for calling the GeomGCNDataset obj's underlying member method code with example usage: obj.has_cache() and returns: os